What is the primary function of an ammeter?

An ammeter is specifically designed to measure electric current in a circuit. It provides a direct measurement of the flow of electrons, typically expressed in amperes (A). When connected in series within a circuit, the ammeter allows for an accurate assessment of current flowing through that particular portion of the circuit. This functionality is crucial for various applications, including troubleshooting and design assessments in electrical engineering, as it helps ensure that circuits are operating within safe and expected current levels.

The other options relate to different electrical measurements: resistance is measured using an ohmmeter, voltage is gauged with a voltmeter, and power consumption is determined using a wattmeter. Each of these instruments serves a distinct purpose and is employed in various contexts, highlighting the unique role that an ammeter plays in measuring current.